A method for making a room temperature stable and nanoscale broadband tunable light emitter. The method is scalable and suitable for industry applications. The fabricated device exhibits tunable light emission in a wavelength range between 590nm and 720nm (corresponding to a 130 nm bandwidth). This tunable broadband light emitter can be used for optoelectronic applications including fiber optics technologies, optical communication technologies, nanoscale light emitting diodes, and nanolasers.